board view: save card title with enter key, no new line

[alexanderdd]

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Is your feature request related to a problem? Please describe.
I frequently change card titles in board view, by clicking on the text and changing it. Currently, enter key creates a new line, which is confusing because line breaks are not allowed in titles anyway. And it is inconsistent, because when editing title in the modal view, hitting enter saves the title.

Describe the solution you'd like

• enter key saves the title and exits edit mode. Enter does not create a new line.

Describe alternatives you've considered
there could also be a "->" button like in the title editing in the modal - not sure - maybe better for mouse users? still, enter should save, even if there is a button to save.

Additional context
cloud.nextcloud.com 30.0.1 -- cannot check Deck version